Sealing-disk for jars



(No Model.)

D. W. JOHNSON. SBA'LING DISK FOR JARS, aw.

No. 408,177. Patented Jul'y 30, 1889.

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UNITED STATES PATENT OFFICE.

DANIEL WV. JOHNSON, OF PHILADELPHIA, PENNSYLVANIA.

SEALlNG-DISK FOR JARS, 85C.

SPECIFICATION forming part of Letters Patent No. 408,177, dated July 30,1889.

Application filed February 16, 1889. Serial No. 300,095. (No model.)

.To a/ZZ whom, t may concern,.-

Be it known that I, DANIEL IV, JOHNSON, a citizen of the United States,and a resident of Philadelphia, Pennsylvania, have invented certainImprovements in Sealing-Disks for Jars, &c., of which the following is aspecilication.

The object of my invention is to provide a simple and effectivesealing-gasket for jars, bottles, boxes, and like receptacles.

In the accompanying drawings, Figure l is a sectional view of the upperportion ot' a jar with a detached cap having my improved sealing-gasketin position therein. Fig. 2 is sectional view showing the jar sealed.Fig. 3 is a perspective view of the gasket. Figs. 4, 5, and 6 are viewsof other forms of gasket embodying the invention; and Fig. 7 is asectional view showing the gasket, Fig. 5, in position on a jar. Fig. Sis a view showing the gasket or ring` on the outside of the j ar-mouth.

Disks or washers for sealing-jars and other vessels having removablelids, and which are required to be air-tight, have usually been made ofrubber, leather, or paper; but I have found by experiments that neitherof these will keep the vessel absolutely airtight. Of the three rubberis to be preferred; but this deteriorates and loses its elasticproperties,

and if used as a seal in direct contact with the articles t0 bepreserved often taints them. Leather is also objectionable on the sameaccount, and paper has not sufiicient elasticity to make a tight joint.

I have found by experiments that by Inaking a water-proof sealing-gasketof parchment or parchmentized fiber, or their equivalents, secured to afelted body, I am enabled to hermetically seal the vessel, while at thesame time the parchment will have no detcriorating eiect upon thecontents of the vessel.

Referring to Fig. 3, a represents a disk of parchment or parchmentizedber, which is impervious to moisture, and to which is cemented inanysuitable manner a disk Z), of any suitable felted material-such as wool,paper, &c..-.providing a soft and elastic backing for the parchment.This Acombined felt and parchment washer is placed in the cap of a jar,as in Fig. 1, for instance, and when the cap is screwed into position,as in Fig. 2, the felt between the cap and the seat around the mouth ofthe vessel will be tightly compressed, making an air and water tightjoint, while at the same time the contact of the contents of the vesselwith the parchment will not inj uriously affect said contents.

In Fig. et I have shown the gasket in the form of a ring, which is usedin the same manner as a rubber ring, being, for instance, seated on theshoulder of a jar, as shown in Fig. 8.

Fig. 5 shows a gasket with parchment or parchment-paper disks a a onboth sides and felted material h between the two outer disks, this formof gasket being particularly available for use with a cap having an opencenter, as shown in Fig. 7. The disk a (shown in Fig. 5) may be of plainpaper-that is to say, paper not waterproofed--so that a label can be'readily pasted thereon.

InFig. 6 I have shown a disk a, of parchment or other water-proofmaterial, having secured to it a ring b, of felt, this ring being insuch position as to be compressed between the cap and the seat aroundthemouth of the vessel, the center portion of the disk a, of water-proofmaterial, being merely for the purpose of preventing the contents ot'the jar from coming in contact with the lid.

It will be understood that in place of the felt, as shown, a softyielding woven fabric may be used; but I prefer in all cases to use thetelt.

I claim as my inventionl. A sealing-gasket for j ars or other vessels,havinga base of water-proof material backed with and secured to a feltedmaterial, substantially as described.

2. A sealing-gasket consisting of a body of felted material havingwater-proof material secured to its opposite faces, substantially asdescribed.

In testimony whereof I have si gncd m y name to this speciiicai ion inthe presence of two subscribing witnesses.

DANIEL WV. JOHNSON.

IVitnesses:

WILLIAM D. CONNER, HENRY HowsoN.

